Multiple switch.



H. W CRANE.

MULTIPLE SWITCH.

APPLICATlON FILED AUG.I6. 1917.

l,322,5%5., Patented Nov. 1919.

"one stamens a ornre HERBERT W. CRANE, OF CHICAGO, ILLINOIS.

MULTIPLE SWITCH.

Specification of Letters Patent.

Application filed August 16, 1917. Serial No. 186,521.

and particularly to a multiple switchsuch as used in the construction disclosed in my Patent No, 1,290,718, operating means for doors, dated Jan. 7, 1919.

An object in the construction herein disclosed is to provide a self-contained predetermined limit switch adapted to successively perform certain operations in tim relation to .a motor driven device. The number of actuations or operations performed by the mechanism is immaterial.

A further object is to provide means in connection with a switch of this sort for adjusting and controlling the permitted limits of operation.

The inventlon will be more readily understood-by reference to the accompanying drawings, wherein: I

Figure 1 is a longtudinal vertical section through a switch constructed in accordance with my invention, the section being taken on line 1-1 of Fig. 2;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1; and

Fig. 3 is a sectional view on line of Fig. 1.

The device comprises a casing 10 and a base member 11. Mounted Within the easing and base-plate in suitable bearings 12, 13, is a shaft which is adapted tobe rlgidly secured to the motor driven part to be controlled. The shaft comprises the reduced end portions 14, 15, a portion of? slightly increased size 16 which carries a sleeve 17,

I and an intermediate threaded portion 18 which supports a reciprocating nut 19. The nut has an upwardly-projecting portion 20, best shown in Fi 3, which occupies a slot 21, formed in a frame, best shown in Fig. 1. This frame comprises cylindrical end portions 22, 23, which fit over the cylindrical sleeves 24,25. The inwardly-projecting peripheral flange 26 on the part 25, has a hearing on the enlarged portion of the shaft. At the opposite end the correspondmg inwardly-projecting flange 27bears on the sleeve 17, which fits over the reduced portion 16 of the shaft. The frame which Patented Nov. 25, 11ers.

comprises the cylindrical ends 22, 23,and

the intermediate arcuate connecting web 28, is rigidly connected to the sleeves 24 25, by means of set-screws 29, 30. 'The inner portions of thesleeves 24, 25, are threaded and accommodate the threaded male por tions or plugs 31, 32. The enlarged heads of these plugs are adapted to accommodate a spanner wrench or similar tool for adustmg the same longitudinally. When properly adjusted the set-screws 29, 30, are employed for securing them in adjusted position. These plugs'serve to define the permissible longitudinal reciprocation of v the nut 19. The parts just described are firmly held in position by means of the nuts 33, 34, which engage threaded portions ofthe shaft at a point contiguous to the enlarged portion thereof.

trol the operation of the different elements are actuated by rotation of the frame and this rotation is efi'ected in the following manner Tt will be understood that the frame and associated parts are maintained in a fixed position by reason of the spring 35, the ends of Which overlapparts of a lug 36 formed as a backwardly-bent hook on the cylindrical end 23 of the frame. The ends 37 of the spring lie on opposite sides of a lug 38, mounted on the shell. .Thus the frame and its associated parts are held in a fixed position, but are permitted to rotate in either direction against the resistance of the spring. The resistance ofiered by the nut 19, to the rotation of the shaft is not sufficient to overcome the resistance of the spring and thus the nut 19, is caused to reciprocate in a straight line. When, however, the nut has traveled to the limit permitted by the plugsf31, 32, it is jaed against the same and all the parts then It will be seen from the description thus K rotated in unison. The switch members are of the frame is a cam plate. 39, shown in section in Fig. 1, and in elevation in Fig. 2. ,This plate has freedom for limited angular movement relative to the frame to the extent of the arcuate slot 40, best shown in Fig. 2,

with which a pin 41, carried by the cylining portion of the bearing member 13 is a second cam plate 45. A spring 46, mounted similarly to the spring 35, serves to retain the cam member 45 in a relatively fixed posi tion. The two ends 47 of the spring, as best shown in Fig. 2, are overlapped and lie on opposite sides of a lug 48, which projects from the upper edge of the cam member 45. The ends also lie on opposite side of .a pin 49, which is fixedin the base. J pair of pawls 50, are pivoted tethe cam member 45, the ends of the pawls normally lying in spaced relation to a lug 51 carried by the cam member 39. The lug 51, and the pawls serve as the means of connection between the cam member 39, and the cam member 45.

As the cam member 39 is rotated, the lug. will contact one of the pawls 50, and carry the cam member 45 along until'the opposite end 52 of the pawl contacts with a projection 53, from the base member, whereupon the pawl will be tripped and the cam member 45 will return to its original position. The

first motion of the cam member 45 is without effect. However, as it continues the cam. 54,

formed by notching the periphery of they cam 45, will contact with the projection on the spring tongue 55 and break the contact 56. Continued rotation of the cam member 45 will cause the projection to contact one or the other of .the' cams 57, thus forcing the spring contact member downwardly andmaking the contact 58.

'The rotation of the frame and connected parts, due to the jamming of the. nut 19, will, due to the operation of the cam members referred to, cause the stoppage of the motor and consequently the interruption of operation of the shaft. The circuits controlled by the switch by means of which the described results are obtained are specifically shown and described in my co-pending application heretofore referred to.. Upon the reversal ofbperatio'n of the motor, the shaft which carrles the nut will be rotated reversely and the nut and associated parts will be carried around with it. This will continue until the projection 20 on .the nut contacts one or the other of the lugs 59, 60, whereby the nut will be forced free, the rotating parts will be properly centered by the action of the spring 35, and the nut is free to travel opposigtely on the frame, a second cam rotatably mounted on the shaft, means carried by said first mentioned cam for causing rotatlon of said second cam with the first cam, means permitting the return of the second cam to its normal position prior to the return of the first cam to normal position, and electrical contacts controlled by said cams, substantially as described. 7

2. In a device of the class described, the combination of a casing having stops, a shaft rotatably mounted in the casing, said shaft having a threaded'portion, a nut carried on said threaded portion, said nut having a portion adapted to contact said i stops in certain positions of the nut, a frame having 99 a slot adapted to be occupied by a portion of said nut to normally prevent the "rotation of said nut, adjustable jam nuts carried by said frame and located at the predetermined limits of travel of said nut, said frame bein adapted to be rotated by the jamming 0 said nut against one of sald am nuts, said stops serving to disengage the nut from its jammed position upon reversed rotation of the shaft, substantially as de- 1 scribed.

3. In a switch, the combination of a shaft having a threaded portion, a-nut mounted on the threaded portion, a frame adapted norl-mally to prevent the rotation of said nut, spring means for retaining said frame in normal position, a projection carried by the frame, a cam member'having an arcuate slot cooperating with said projection whereby said cam member is permitted certain limit- 11@ ed freedom of movement, contact members controlled by said cam, a second cam, spring means for retaining said last named cam in centered position,v means carried by said frame for engaging said second cam to cause rotation thereof w1th the frame, and means for disen aging said second cam from the frame and permitting the return of the sec- 0nd cam to a normal positionindependently of the return-of the frame, substantially as 1% described. I t 4. In an electrical switch, the combination of a threaded shaft, a frame mounted there-. on with freedom for limited angularmovement, a nut engaging the frame and adapted to cause said limited an lar movement at the extreme positions 0 said nut, a cam member, contacts. controlled'thereby, spring means for normally retaining said cam member in a centered position, means carried by the frame and-cam for causing the cam to move with the frame in either direction of rotation, and means for disengaging the cam from the frame before said frame has reached its limit of rotation whereby said cam is permitted to return to its original position, substantially as described Signed at Chicago, 111., this 14th day of 10 Aug, 1917.

HERBERT W0 CRANE.

Witness:

' L. J. CHASE. 

